It's very very normal. Even my aunt, who just celebrated her 10 year anniversary with her husband told me: "Even when you're married, there is going to be attraction to other people, on both sides. It's how the two you deal with those attractions that makes a successful relationship." It was actually one of the best things she ever told me.

I have been in two long term relationships with people I love very much and I have found myself having little 'crushes' on other people. But that's all they were, and I recognized that. If you love your bf more, you won't pursue anything.